Date of birth
Republic of Ireland
Irishman Mark re-joined the club in July 2016, having spent two seasons at Crawley between 2012-14 when the club were in League One.
The former Wolves and Bolton central defender joined Kilmarnock after his first spell with the Reds and was made club captain at Killie, although his second year at Rugby Park was disrupted when he broke his shoulder. He returned to Reds in the summer of 2016 and had made 165 appearances for the club ahead of the 2018-19 season.